code to determine the ordinal suffix for a given integer

ordinal.php

function ordinal($number)
{
    $ends = array(
        'th',
        'st',
        'nd',
        'rd',
        'th',
        'th',
        'th',
        'th',
        'th',
        'th'
    );
    if ((($number % 100) >= 11) && (($number % 100) <= 13)) return $number . 'th';
    else return $number . $ends[$number % 10];
}